School-slate



UNITED STATES PATENT OFFICE.

JOSEPH- MEDER, OF LOUISVILLE, KENTUCKY.

SCHOOL-SLATE.

SPECIFICATION forming partei' Letters Patent No. 283,267', dated August 14, 1883.

` Application filed June 11, (No model.)`

To all whom it may concern: Be it known that I, JOSEPH MEDER, a` citiy zen of the United States, residing at Louisville, in the county of Jefferson and State of Kentucky, have invented'certain new and useful Improvements 'in Reversible Slates; and I do declare the following. to be a full, clear, and exact `description of the invention, such as will enable others skilled in the art to which `it appertains to makeand use the same, reference being had to the accompanying drawings, and to lettersor figures of reference marked thereon,which form a part of this specification.

` Figure 'l of the drawings is a representation of this invention, and is a perspective View. Fig. 2 is a detail showing a perspective view of thehinge-plate and wires. Fig. 3 is a vertical section through a portion of the back of the slate, taken in line with one of the wire fastenings of the hinge.

This inventionV has relation to reversible slates; and it consists in the construction and novel arrangement of the bent wires extending through the slate-frames into the grooves thereof, and the bent or extensible hinge-plate designed to adapt itself to the thickness of the frame. all as hereinafter set forth.

In the accompanying drawings, the letter a designates the back portions of the Vslate- 30 frames which are to be connected together. The groove of the frameis indicated at b. @represents a wire having the rectangularly-` Asaid groove, to provide a fastening, as shown bent arms d, which extend through perforations e of the slate-frame `into the groove b, and along at g. The arms are rst passed throughthe perforations e, and then bent along and intoV the groove.

h indicates the hingeplate ,which is bent at its ends around the middle or pivoted portions of the wires to form the barrels k of the hinge.l Between the barrels the hinge-plate is bent in `convex form, as shown at l, so that it can be this invention, what I 0 ble slate, the bent wires extending into the grooves thereof, and the 'hinge-plate having the end barrels and the bent middle portion 55 between said barrels, designed to adapt itself Y to the thickness of the slate-frames, substantially as specified. i

In testimony whereof I affix my signature in presence of two witnesses.

` JOSEPH `MEDER.

` Witnesses:

CARL JOHNSTON, A GEo. MARKER.

`desire to secure by Letters Patent, 5o 

